高中数学必考公式?1、两角和公式 sin#28A B#29=sinAcosB cosAsinB sin#28A-B#29=sinAcosB-sinBcosAcos#28A B#29=cosAcosB-sinAsinB cos
高中数学必考公式?
1、两角世界杯和公式{练:shì} sin#28A B#29=sinAcosB cosAsinB sin#28A-B#29=sinAcosB-sinBcosA
cos#28A B#29=cosAcosB-sinAsinB cos#28A-B#29=cosAcosB sinAsinB
tan#28A B#29=#28tanA tanB#29/#281-tanAtanB#29 tan#28A-B#29=#28tanA-tanB#29/#281 tanAtanB#29
ctg#28A B#29=#28ctgActgB-1#29/#28ctgB ctgA#29 ctg#28A-B#29=#28ctgActgB 1#29/#28ctgB-ctgA#29
澳门新葡京倍角公式shì tan2A=2tanA/#281-tan2A#29 ctg2A=#28ctg2A-1#29/2ctga
cos2a=cos2a-sin2a=2cos2a-1=1-2sin2a/2、半角(读:jiǎo)公式(练:shì) sin#28A/2#29=√#28#281-cosA#29/2#29 sin#28A/2#29=-√#28#281-cosA#29/2#29
cos#28A/2#29=√#28#281 cosA#29/2#29 cos#28A/2#29=-√#28#281 cosA#29/2#29
tan#28A/2#29=√#28#281-cosA#29/#28#281 cosA#29#29 tan#28A/2#29=-√#28#281-cosA#29/#28#281 cosA#29#29
ctg#28A/2#29=√#28#281 cosA#29/#28#281-cosA#29#29 ctg#28A/2#29=-√#28#281 cosA#29/#28#281-cosA#29#29/3、和差(练:chà)化(练:huà)积{繁:積} 2sinAcosB=sin#28A B#29 sin#28A-B#29 2cosAsinB=sin#28A B#29-sin#28A-B#29
tanA tanB=sin#28A B#29/cosAcosB tanA-tanB=sin#28A-B#29/cosAcosB
ctgA ctgBsin#28A B#29/sinAsinB -ctgA ctgBsin#28A B#29/sinAsinB/
4、某些【读:xiē】数列[读:liè]前n项[繁体:項]和 1 2 3 4 5 6 7 8 9 … n=n#28n 1#29/2 1 3 5 7 9 11 13 15 … #282n-1#29=n#2A2
13 23 33 43 53 63 …n3=n2#28n 1#292/4 1#2A2 2#2A3 3#2A4 4#2A5 5#2A6 6#2A7 … n#28n 1#29=n#28n 1#29#28n 2#29/3
5、圆的de 一般方程 x2 y2 Dx Ey F=0 注:D2 E2-4F
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